Dos it chime when you try and boot? Try holding down Option + Command + R for several seconds. This will attempt to connect to the internet recovery option. Check the ports and see if you hook up an external monitor click here
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What is Markdown?
Markdown lets you add more formatting to your post. Simply type in your post and it will display as written.
If you wish to add bold or italic characters, add a hyperlink to another website, a heading or a horizontal line, simply use the relevent icons above the text input field.
A preview of your post will appear in the grey box below. If you make a change and you're not happy, simply press the back arrow icon to undo.